<template>
  <div>
    <h2 style="text-align: center;">发布新课程</h2>

    <el-steps :active="2" process-status="wait" align-center style="margin-bottom: 40px;">
      <el-step title="填写课程基本信息" />
      <el-step title="创建课程大纲" />
      <el-step title="最终发布" />
    </el-steps>

    <el-button type="text" @click="openSaveDialog">添加章节</el-button>
    <!-- 章节 -->
    <ul class="chanpterList">
      <li v-for="chapter in chapterVideoList" :key="chapter.id">
        <p>
          {{ chapter.title }}
          <span class="acts">
            <el-button type="text" @click="openVideoDialog(chapter.id)">添加课时</el-button>
            <el-button style type="text" @click="openUpdateDialog(chapter.id)">编辑</el-button>
            <el-button type="text" @click="deleteChapter(chapter.id)">删除</el-button>
          </span>
        </p>

        <!-- 视频 -->
        <ul class="chanpterList videoList">
          <li v-for="video in chapter.children" :key="video.id">
            <p>
              {{ video.title }}
              <span class="acts">
                <el-button style type="text">编辑</el-button>
                <el-button type="text" @click="deleteVideo(video.id)">删除</el-button>
              </span>
            </p>
          </li>
        </ul>
      </li>
    </ul>
    <!-- 添加和修改章节表单 -->
    <el-dialog :visible.sync="dialogChapterFormVisible" title="添加章节">
      <el-form :model="chapter" label-width="120px">
        <el-form-item label="章节标题">
          <el-input v-model="chapter.title" />
        </el-form-item>
        <el-form-item label="章节排序">
          <el-input-number v-model="chapter.sort" :min="0" controls-position="right" />
        </el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="dialogChapterFormVisible = false">取 消</el-button>
        <el-button type="primary" @click="saveOrUpdate">确 定</el-button>
      </div>
    </el-dialog>
    <div>
      <el-button @click="previous">上一步</el-button>
      <el-button :disabled="saveBtnDisabled" type="primary" @click="next">下一步</el-button>
    </div>

    <!-- 添加和修改课时表单 -->
    <el-dialog :visible.sync="dialogVideoFormVisible" title="添加课时">
      <el-form :model="video" label-width="120px">
        <el-form-item label="课时标题">
          <el-input v-model="video.title" />
        </el-form-item>
        <el-form-item label="课时排序">
          <el-input-number v-model="video.sort" :min="0" controls-position="right" />
        </el-form-item>
        <el-form-item label="是否免费">
          <el-radio-group v-model="video.free">
            <el-radio :label="true">免费</el-radio>
            <el-radio :label="false">默认</el-radio>
          </el-radio-group>
        </el-form-item>

        <el-form-item label="上传视频">
          <!-- 该上传组件是自动上传组件，即视频直接上传到后端 -->
          <el-upload
            :on-success="handleVodUploadSuccess"
            :on-remove="handleVodRemove"
            :before-remove="beforeVodRemove"
            :on-exceed="handleUploadExceed"
            :file-list="fileList"
            :action="BASE_API+'/eduvod/video/upload'"
            :limit="1"
            class="upload-demo"
          >
            <el-button size="small" type="primary">上传视频</el-button>
            <el-tooltip placement="right-end">
              <!-- 友好提示 -->
              <div slot="content">
                最大支持1G，
                <br />支持3GP、ASF、AVI、DAT、DV、FLV、F4V、
                <br />GIF、M2T、M4V、MJ2、MJPEG、MKV、MOV、MP4、
                <br />MPE、MPG、MPEG、MTS、OGG、QT、RM、RMVB、
                <br />SWF、TS、VOB、WMV、WEBM 等视频格式上传
              </div>
              <i class="el-icon-question" />
            </el-tooltip>
          </el-upload>
        </el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="dialogVideoFormVisible = false">取 消</el-button>
        <el-button :disabled="saveVideoBtnDisabled" type="primary" @click="saveOrUpdateVideo">确 定</el-button>
      </div>
    </el-dialog>
  </div>
</template>

<script>
import ChapterApi from "@/api/edu/chapter";
import VideoApi from "@/api/edu/video";
export default {
  components: {},
  props: {},
  data() {
    return {
      saveBtnDisabled: false, // 保存按钮是否禁用
      saveVideoBtnDisabled: false,
      courseId: "",
      chapterVideoList: [], //章节列表
      dialogChapterFormVisible: false,
      dialogVideoFormVisible: false,
      chapter: {
        title: "",
        sort: 0,
        courseId: ""
      },
      //小节对象
      video: {
        title: "",
        sort: 0,
        free: 0,
        videoSourceId: "",
        courseId: "",
        chapterId: "",
        videoOriginalName: "" //文件原始名称
      },
      fileList: [], //上传文件列表
      BASE_API: process.env.BASE_API // 接口API地址
    };
  },
  watch: {},
  computed: {},
  methods: {
    //移除视频,即点击确定之后执行
    handleVodRemove() {
      VideoApi.deleteAlyVideo(this.video.videoSourceId).then(res => {
        //提示删除成功
        this.$message({
          type: "success",
          message: "删除视频成功!"
        });
        //请看文件列表的数据
        this.fileList = [];
        //清空视频id和文件原始名称，防止存入数据库中
        this.video.videoSourceId = "";
        this.video.videoOriginalName = "";
      });
    },
    //移除视频之前调用,即点击叉号时调用
    beforeVodRemove(file, fileList) {
      return this.$confirm(`确定移除 ${file.name}？`);
    },
    //视频上传成功之后的回调函数
    handleVodUploadSuccess(res, file, fileList) {
      //res代表后端响应数据
      //获取视频id
      this.video.videoSourceId = res.data.videoId;
      //获取文件原始名称
      this.video.videoOriginalName = file.name;
    },
    //视频上传前的校验,一次只能上传一个视频文件
    handleUploadExceed() {
      this.$message.warning("想要重新上传视频，请先删除已上传的视频");
    },
    //打开小节窗口
    openVideoDialog(chapterId) {
      this.video = {
        title: "",
        sort: 0,
        free: 0,
        videoSourceId: ""
      };
      this.fileList=[]
      this.dialogVideoFormVisible = true;
      this.video.chapterId = chapterId;
    },
    //打开编辑窗口
    openUpdateDialog(chapterId) {
      this.dialogChapterFormVisible = true;
      ChapterApi.getChapter(chapterId).then(res => {
        this.chapter = res.data.chapter;
      });
    },
    //打开保存窗口
    openSaveDialog() {
      this.dialogChapterFormVisible = true;
      this.chapter = {
        title: "",
        sort: 0
      };
    },
    //删除小节
    deleteVideo(videoId) {
      this.$confirm("您要进行删除操作吗, 是否继续?", "提示", {
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning"
      })
        .then(() => {
          VideoApi.deleteVideo(videoId).then(res => {
            this.$message({
              type: "success",
              message: "删除成功!"
            });
            //刷新页面
            this.getChapterVideo();
          });
        })
        .catch(() => {});
    },
    //TODO 修改小节
    //保存小节
    saveVideo() {
      this.video.courseId = this.courseId;
      VideoApi.addVideo(this.video).then(res => {
        //关闭弹窗
        this.dialogVideoFormVisible = false;
        //提示信息
        this.$message({
          type: "success",
          message: "课程小节添加成功"
        });
        //刷新页面
        this.getChapterVideo();
      });
    },
    //保存或修改小节信息
    saveOrUpdateVideo() {
      this.saveVideo();
    },
    //删除
    deleteChapter(chapterId) {
      this.$confirm("您要进行删除操作吗, 是否继续?", "提示", {
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning"
      })
        .then(() => {
          ChapterApi.deleteChapter(chapterId).then(res => {
            this.$message({
              type: "success",
              message: "删除成功!"
            });
            //刷新页面
            this.getChapterVideo();
          });
        })
        .catch(() => {});
    },
    saveChapter() {
      this.chapter.courseId = this.courseId;
      ChapterApi.addChapter(this.chapter).then(res => {
        //关闭弹窗
        this.dialogChapterFormVisible = false;
        //提示信息
        this.$message({
          type: "success",
          message: "课程章节添加成功"
        });
        //刷新页面
        this.getChapterVideo();
      });
    },
    //更新
    updataChapter() {
      ChapterApi.updateChapter(this.chapter).then(res => {
        //关闭弹窗
        this.dialogChapterFormVisible = false;
        //提示信息
        this.$message({
          type: "success",
          message: "课程章节修改成功"
        });
        //刷新页面
        this.getChapterVideo();
      });
    },
    //保存或更新
    saveOrUpdate() {
      if (!this.chapter.id) {
        this.saveChapter();
      } else {
        this.updataChapter();
      }
    },
    previous() {
      this.$router.push({ path: "/course/info/" + this.courseId });
    },

    next() {
      this.$router.push({ path: "/course/publish/" + this.courseId });
    },
    //获取章节
    getChapterVideo() {
      ChapterApi.getChapterVideo(this.courseId).then(res => {
        this.chapterVideoList = res.data.list;
      });
    }
  },
  created() {
    //从路由中获取课程id
    if (this.$route.params && this.$route.params.id) {
      this.courseId = this.$route.params.id;
      this.getChapterVideo();
    }
  },
  mounted() {}
};
</script>
<style scoped>
.chanpterList {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}
.chanpterList li {
  position: relative;
}
.chanpterList p {
  float: left;
  font-size: 20px;
  margin: 10px 0;
  padding: 10px;
  height: 70px;
  line-height: 50px;
  width: 100%;
  border: 1px solid #ddd;
}
.chanpterList .acts {
  float: right;
  font-size: 14px;
}

.videoList {
  padding-left: 50px;
}
.videoList p {
  float: left;
  font-size: 14px;
  margin: 10px 0;
  padding: 10px;
  height: 50px;
  line-height: 30px;
  width: 100%;
  border: 1px dotted #ddd;
}
</style>